Life Cycle of Testing

Earlier, Testing was performed by developers themselves. After the developers implemented and tested the software, it was deployed to the clients. Later it was realized that developers testing the code was not enough and gradually testing became an individual phase in the Software Development Life Cycle (SDLC). See Figure 2. Figure 2 displays that testing was performed after the implementation of developed software and before the software was deployed to the clients.

Figure 2 - Software Development Life Cycle (Waterfall Model)

This figure depicts the high level phases of SDLC.

However, nowadays people have accepted Testing as parallel phase to the Development phase. Many software companies have a Software Testing Life Cycle (STLC) performed parallel to SDLC. See Figure 3 to view the STLC.

                                       

                                                Figure 3 - Software Testing Life Cycle (STLC)

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